Ajax ModalPopUpExtender In GridView Example To Show Master

Question

Hi,      
  Ajax ModalPopUpExtender In GridView Example To Show Master Detail Or Parent Child Data As PopUp using asp.net design pattern.i tried but,i getting error.please help me on this issue,its very useful to me
(When i Click on the link butoon in gridview ,table2 data should appear)
Here is my complete code with database.


ERROR:

'Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource.'